Seawater Butterfly Valve Actuators: How to Specify Coastal Corrosion Protection
Seawater Butterfly Valve Actuators: How to Specify Coastal Corrosion Protection Quick Summary: Specify seawater butterfly valve actuators as complete operating packages. Identify salt-spray, splash, flooding, washdown and condensation exposure; then define the coating system, enclosure protection, mounting hardware, cable entries and accessories. An IP rating addresses enclosure protection, while coating qualification addresses a different requirement. […]
Bellows Seal Valve Cycle Life: How to Review Supplier Test Data
Bellows Seal Valve Cycle Life: How to Review Supplier Test Data Quick Summary: Bellows seal valve cycle life is not a stand-alone number. Review the tested assembly, stroke, pressure, temperature, medium, operating rate, sample count and failure criteria together. Distinguish a test stopped after a target count from a test continued to failure. Confirm that […]
Trunnion Ball Valve Seat Injection: Emergency Sealing vs Routine Lubrication
Trunnion Ball Valve Seat Injection: Emergency Sealing vs Routine Lubrication Quick answer: Trunnion ball valve seat injection can provide a route for an approved sealant to help control seat leakage. It does not automatically mean the valve needs routine greasing. Some designs permit planned lubrication or cleaning through dedicated passages; others treat injection primarily as […]
Steam Isolation Valve Bypass: When Is Pressure Equalization Needed?
Quick Summary: A steam isolation valve bypass is a smaller, controlled flow path around the main shut-off valve. Consider it when the main valve cannot be opened within its approved differential-pressure limit, or when downstream piping needs a separately controlled warm-up flow. Pressure equalization, pipe warm-up and valve-body cavity relief are different duties. The bypass […]